21125322422013 has 4 divisors (see below), whose sum is σ = 28167096562688. Its totient is φ = 14083548281340.

The previous prime is 21125322421997. The next prime is 21125322422023. The reversal of 21125322422013 is 31022422352112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21125322422013 - 2⁴ = 21125322421997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21125322422023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3520887070333 + ... + 3520887070338.

It is an arithmetic number, because the mean of its divisors is an integer number (7041774140672).

Almost surely, 2^{21125322422013} is an apocalyptic number.

It is an amenable number.

21125322422013 is a deficient number, since it is larger than the sum of its proper divisors (7041774140675).

21125322422013 is an equidigital number, since it uses as much as digits as its factorization.

21125322422013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7041774140674.

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 21125322422013 its reverse (31022422352112), we get a palindrome (52147744774125).

The spelling of 21125322422013 in words is "twenty-one trillion, one hundred twenty-five billion, three hundred twenty-two million, four hundred twenty-two thousand, thirteen".